Phi-tiny-MoE-instruct-GPTQ-W4-MixedGroup-G32-G128

This is a GPTQ-quantized version of microsoft/Phi-tiny-MoE-instruct, created with GPTQModel 7.3.4. It is intended as a small mixed-group-size PhiMoE checkpoint and loader integration fixture.

What is special about this checkpoint?

The global configuration is symmetric W4G128. Exact per-module dynamic overrides use W4G32 for attention Q/K/V and every expert gate/up projection. This is mixed group-size quantization; all quantized weights use 4 bits.

Projection family Modules per layer Configuration Modules in 32 layers
Attention Q/K/V 3 W4G32 96
Attention output 1 W4G128 32
16 experts x gate/up 32 W4G32 1,024
16 experts x down 16 W4G128 512
Total 52 1,664

Across the complete model:

  • All 32 decoder layers and all 16 experts per layer are quantized.
  • 1,120 projections use W4G32 dynamic overrides.
  • 544 projections use the global W4G128 setting.
  • The 32 routers and lm_head remain dense by design.
  • qweight, qzeros, scales, and g_idx are present for all 1,664 quantized projections.

Quantization details

Setting Value
Source dtype BF16
Method / format GPTQ / gptq
Bits 4 everywhere
Global group size 128
Dynamic group size 32
Symmetric Yes
Activation order (desc_act) No
Group-aware activation ordering Yes
Sequential quantization Yes
MSE search 2
Pack dtype / implementation INT32 / GPU
Calibration samples 257
Calibration concatenation size 4,096 tokens
Observed attention calibration tokens 97,946
Checkpoint layout One unsharded model.safetensors file
Quantization runtime GPTQModel 7.3.4, Transformers 5.14.1, Torch 2.9.1+cu130

Every expert received a nonzero number of calibration activations during quantization.

Loading

from gptqmodel import BACKEND, GPTQModel

model = GPTQModel.load(
    "ModelCloud/Phi-tiny-MoE-instruct-GPTQ-W4-MixedGroup-G32-G128",
    backend=BACKEND.GPTQ_TORCH,
    device="cuda",
)

Validation reloads all 1,664 quantized projections with the expected group sizes and completes a finite-logit forward pass. No downstream quality benchmark is claimed; evaluate the checkpoint for the intended use case.

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